Hello venkat ....

For Josaa counselling if you have selected in EWS category then it is necessary to take EWS certificate to counselling because on that category you would have got nice colleges than your common rank.

So you can get a certificate format of EWS category from josaa official site below:

https://josaa.nic.in/webinfocms/Public/View.aspx?page=73

You have to get certified by an officer not below the rank of Tehsildar in the States/UTs. And you might lose your seat also so please get it done.